(under subclass 214) Subject matter wherein some chemical, composition, material, or mixture of materials is added to the paramagnetic particles to enhance the viewing of the particles with respect to the object tested after the particles are magnetized and attracted to the magnetized object tested.
(1) Note. The chemical, composition, material, or mixture may be directly placed on or diffused some way into the magnetic particles, or may form a dry mixture with the particles or a liquid vehicle for the magnetic particles.
(2) Note. Coatings, dyes, and liquid and solid mixtures of material with the particles are in this subclass.
(3) Note. Fluorescent and phosphorescent material which require radiation on these materials to emit light are here as well as materials which have optical properties to permit the particles to be more easily distinguished from the object and the surroundings of the test.
